#pragma once
#include <string>

class Quote
{
public:
    Quote() =default;
    Quote(const std::string &book, double sales_price): bookNO(book), price(sales_price) {}
    std::string isbn() const;
    virtual double net_price(std::size_t n) const;
};

class Bulk_quote : public Quote
{
public:
    double net_price(std::size_t n) const override;
};